Open WebUIvsCartesia

Full side-by-side comparison — features, pricing, platforms, and which one wins in 2026.

Open WebUI

Chat Interfaces

Beautiful self-hosted ChatGPT-like interface for any LLM

Full review →Website ↗

Cartesia

Voice & Audio

Ultra-low-latency realtime voice AI (Sonic)

Full review →Website ↗
FeatureOpen WebUICartesia
CategoryChat InterfacesVoice & Audio
PricingFree (open-source)Free tier + usage-based
GitHub Stars
✓ More stars
65k
—
PlatformsmacOS, Linux, Windows, DockerWeb, API
Key Features
  • ✓ Ollama integration
  • ✓ Multi-model
  • ✓ RAG
  • ✓ Web search
  • ✓ Voice input/output
  • ✓ Plugins
  • ✓ User management
  • ✓ Sub-100ms TTS
  • ✓ Instant voice cloning
  • ✓ Realtime API
  • ✓ On-device models
Pros
  • + Feature-rich ChatGPT alternative
  • + Supports Ollama + OpenAI APIs
  • + Document upload and RAG
  • + Multi-user with auth
  • + Very active development
—
Cons
  • − Requires Docker for easy setup
  • − Can be slow with large documents
  • − Plugin ecosystem still growing
  • − Resource intensive
—
Tags
open-sourcechatuiollamaself-hosted
voicettsrealtimeagents

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